Electric furnace



May 22, 1951 T. M. WYMORE ELECTRIC FURNACE Filed Aug. 4, 1949 Fig. 8

Juventor Gttomeg Patented May 22, 1951 UNITED STATES iPATENT OFFICE This invention relates to hot air furnaces and more particularly, it is an object of this invention to provide an improved electrical furnace.

Another object is to provide a heater which can be easily attached to hot air ducts of the type thermostatically, avoiding sudden and extremechanges of temperature.

Yet another object of the invention is to provide a device for the purpose described which is sturdy and durable in construction, reliable and eflicient in operation, and relatively simple and inexpensive to manufacture, assemble and utilize.

Other and still further objects and advantages of the invention will become apparent from the following detailed description of a preferred embodiment thereof.

In the drawing:

Figure 1 is a side elevation of the new electrica1 air heater, a portion of the outer casing being shown broken away for purposes of illustration.

Figure 2 is a view in section taken substantially on the line 2 2 of Figure 1.

Figure 3 is a front elevation of one of the re- Sistance coils of the furnace and the supporting grid therefor.

Figure 4 is a side elevation of the heating element and grid shown in Figure 3.

Referring now to the drawing for a more particular description and first to Figure 1, I indicates an air duct to which the heating element housing of this invention is secured, as indicated at l2.

The housing I2 is provided with a floor plate I4 which is of rectangular shape and is provided with one or more air admittance apertures I5 therethrough. The apertures I5 are positioned immediately inward from the outer edges of the floor plate.

Fhe rectangular housing I2 is outwardly flared at its upper end as shown at I6 where the housing joins the duct ID.

The housing I2 is secured to the duct I0 and is disposed in communication therewith at the open upper end of the housing,

2 Claims. (Cl. 21939) A heating block 22 is provided and has a plurality of flat, parallel equidistantly spaced apart slots 30 therein and extending upwardly from the bottom thereof. The block 22 is preferably formed of aluminum and rests upon the floor plate I4.

The upper side edges 26 of the block 22 are preferably curved for permitting air to rise upwardly from the sides of the block 22 in operation and as indicated by the arrows 30. A plurality of like frames or grids 32 are provided as best seen in Figures 3 and 4; each grid 32 preferably includes a plurality of parallel interconnected portions 34 around which latter a resistance wire 36 is wound to form resistance elements for insertion into the slots 30 of the block '22.

The resistance wire 36 of each heating element is disposed with its ends connected to terminal posts 38 adjacent the bottom of the grid 32. A lead-in cable portion 4!} is disposed attached to each heating element, each portion 40 having two Wires 42 secured, one each, to the posts 38.

The portions 4|} are connected to a terminal box 44 and a lead-in wire 50 is also disposed entering the terminal box 44, the arrangement of wires in the box 44 being such as to conduct electricity from the wire 50 to the wires 40.

The wire 50 can be secured by any suitable means to an electrical circuit.

The elements are each disposed through a separate opening in the bottom wall or base I4. The openings 60 are disposed in use beneath the slots 30.

The grids 32 are each provided with a pair of spring clips Ill disposed one clip on each side of the bottom end of each grid. The clips ID are inclined outwardly at their free upper ends in a manner whereby they tend to hold the grids 32 in position in the opening 60 once the grids 32 are inserted through the opening 60.

The housing I2 can be provided with inwardly curved upper end portions 983 adjacent the duct I0 and on the elongated side walls 92 thereof for conducting heat upwardly to the duct II] from the side of the block 22, as indicated by the arrow I 00 in Figure 2.

In operation, the elements will become heated, heating the block 26 and causing cold air to flow upwardly from the block 26, partly in the directions of the arrows 36' and I00.

The air is then carried by the duct In to the rooms of the dwelling in a usual manner.

At times when a thermostat, not shown, is used to turn the electricity 0n and off, it will be seen that there will be no sharp rises and chilling drops in temperature because of the time required for the block 22 to lose its stored heat. An even heating is thus insured.

From the foregoing description it is thought to be obvious that an electric furnace constructed in accordance with my invention is particularly well adapted for use by reason of the convenience and facility with which it may be assembled and operated, and it will also be obvious that my invention is susceptible of some change and modi fication without departing from the principles and spirit thereof, and for this reason I do not wish to be understood as limiting myself to the precise arrangement and formation of the several parts herein shown in carrying out my invention in practice, except as claimed.

I claim:

1. In an electric heater, the combination which comprises a horizontally disposed base having openings therethrough, a heat transferring block having parallel spaced slots extended upwardly therein from the lower surface mounted on said base, a housing mounted on the base and having side walls extended upwardly from the edges of the base with the said side walls spaced from the said heat transferring block, an air circulating duct extended through the upper end of the housing with the ends thereof extended from the ends of the housing providing connections, to

heating ducts leading from the heater, and in-- dependently mounted electric heating elements extended upwardly through the openings in the intermediate part of the base and into the slots Of the heat transferring block whereby the elements are independently replaceable.

2, In an electric heater, the combination which I comprises a rectangular-shape heat transferring block having arcuate upper edges and having Spaced transversely disposed slots extended upwardly therein from the lower end thereof, a horizontally disposed base having slots therein corresponding with the slots of the heat transferring block and having edges with openings therethrough extended beyond the sides and ends of the block, a housing having side and end walls spaced from the sides and ends of the block, respectively, extended upwardly providing a housing around the block and the said sides having arcuate upper edges spaced from and corresponding with the said arcuate upper edges of'the block, a longitudinally positioned duct extended through the upper part of the housing, and a plurality of grids having heating elements carried thereon extended upwardly through the slots of the base and into the slots of the said heat transferring block.

THOMAS M. WYMORE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,052,834 Lawrence Feb. 11, 1913 1,054,409 Harrison et a1. Feb. 25, 1913 2,313,786 Van Daam Mar. 16, 1943 2,427,113 Warring Sept. 9, 1947 2,438,670 MacDonald et a1. Mar. 30, 1948 2,450,983 Osterheld Oct. 12, 19% 

